231321404 has 12 divisors (see below), whose sum is σ = 413425824. Its totient is φ = 113199744.

The previous prime is 231321383. The next prime is 231321407. The reversal of 231321404 is 404123132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231321407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 615029 + ... + 615404.

It is an arithmetic number, because the mean of its divisors is an integer number (34452152).

Almost surely, 2^231321404 is an apocalyptic number.

It is an amenable number.

231321404 is a deficient number, since it is larger than the sum of its proper divisors (182104420).

231321404 is a wasteful number, since it uses less digits than its factorization.

231321404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230484 (or 1230482 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 231321404 is about 15209.2538936004. The cubic root of 231321404 is about 613.8636818192.

Adding to 231321404 its reverse (404123132), we get a palindrome (635444536).

The spelling of 231321404 in words is "two hundred thirty-one million, three hundred twenty-one thousand, four hundred four".